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To: Niko Sams <niko.sams@gmail.com>
Cc: gdb <gdb@sourceware.org>
Subject: Re: Modify address of a gdb.Value
References: <629542d40906142322h733ad7ffr3d6daeb7b306ff7a@mail.gmail.com> 	<m3prd55txo.fsf@fleche.redhat.com> 	<629542d40906162251v4a4723f3l9423eec5998d0ee6@mail.gmail.com>
From: Tom Tromey <tromey@redhat.com>
Reply-To: tromey@redhat.com
Date: Wed, 17 Jun 2009 16:21:00 -0000
In-Reply-To: <629542d40906162251v4a4723f3l9423eec5998d0ee6@mail.gmail.com> (Niko Sams's message of "Wed\, 17 Jun 2009 07\:51\:28 +0200")
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>>>>> "Niko" == Niko Sams <niko.sams@gmail.com> writes:

Niko> I tried to implement this payload method in python
[...]
Niko> the obvious solution would be gdb.lookup_type('QMapPayloadNode<%s,
Niko> %s>' % (self.ktype, self.vtype)).sizeof
Niko> but that doesn't work, i get this error:
Niko> RuntimeError: No type named QMapPayloadNode<int, QString *>
Niko> This is because that QMapPayloadNode is not instanciated, it's only
Niko> used for this sizeof.

Niko> So any idea how i can compute the payload?

There's no easy way.  gdb only knows what the compiler tells it, and
in this case, the information is omitted.

You could try recreating the ABI struct layout rules in Python.
This is a pain but not insanely hard.

Tom